import functools

from flask import (
    Blueprint, flash, g, redirect, render_template, request, session, url_for
)
from hashlib import md5
from create_db import User, get_session, get_engine
from share import get_all_shared

bp = Blueprint('auth', __name__, url_prefix='/auth')

@bp.route('/register', methods=('GET', 'POST'))
def register():

    Session = get_session()
    with Session() as dbsession:
        if request.method == 'POST':
            username = request.form['username']
            password = request.form['password']
            mail     = request.form['email'] 
            error = None

            #@TODO check if this really is an email.
            if not username:
                error = 'Username is required.'
            elif not password:
                error = 'Password is required.'
            elif not mail:
                error = 'Please enter your email adress.'
            elif dbsession.query(User).filter(User.username == username).first() != None:
                error = "Username already exists, please choose another one."
            elif dbsession.query(User).filter(User.email == mail).first() != None:
                error = "This email adress is already in use, please choose another one."

            if error is None:
                try:
                    user = User(username=username, password=md5(password.encode("utf-8")).hexdigest(), email=mail, settings = "")
                    dbsession.add(user)
                    dbsession.commit()

                    #Preden zapremo naj user dobi vse shared karte od prej.
                    new_user = dbsession.query(User).filter(User.username == username).first()
                    new_user_id = new_user.id
                    
                    get_all_shared(new_user_id)

                    dbsession.close()


                except Exception as e:
                    error = f"napaka pri registraciji {username} je {e}"
                else:
                    return redirect(url_for("auth.login"))

            flash(error)
    get_engine().dispose()

    return render_template('register.html')


@bp.route('/login', methods=('GET', 'POST'))
def login():
    if request.method == 'POST':

        Session = get_session()
        with Session() as dbsession:
            username = request.form['username']
            password = request.form['password']
            error = None
            user = dbsession.query(User).filter(User.username == username).first()
            
            if user is None:
                error = 'Incorrect username.'
            elif not user.password == md5(password.encode("utf-8")).hexdigest(): #compare input pw has and bd pw hash

                error = 'Incorrect password.'

            if error is None:
                session.clear()
                session['user_id'] = user.id
                session['username'] = user.username
                return redirect(url_for("menu.index")) #TODO ne dela
            flash(error)
        
        get_engine().dispose()
    return render_template('login.html')


@bp.before_app_request
def load_logged_in_user():
    user_id = session.get('user_id')

    if user_id is None:
        g.user = None
    else:
        g.user = None


@bp.route('/logout')
def logout():
    session.clear()
    return redirect(url_for('index'))


def login_required(view):
    @functools.wraps(view)
    def wrapped_view(**kwargs):
        if g.user is None:
            return redirect(url_for('auth.login'))

        return view(**kwargs)

    return wrapped_view